Estimation of Bouguer correction density based on underground and surface gravity measurements and precise modelling of topographic effects – two case studies from Slovakia

Zahorec, Pavol; Papčo, Juraj

doi:10.2478/congeo-2018-0015

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…To obtain the complete Bouguer anomalies (CBA) data, the Bouguer and terrain corrections have been applied to the gravity disturbance data. The Bouguer correction was used to eliminate the mass effect located between the measurement points on the topographic surface to the datum, which was not taken into account even though this mass greatly affected the gravity anomaly data [32]. Meanwhile, the purpose of terrain correction was to eliminate the mass influence around the measurement point.…”

Section: Results Of Processing Datamentioning

confidence: 99%

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Sehah

Prabowo

Raharjo

et al. 2022

CST

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Slamet Volcano (3,432 m) is the highest volcano in Central Java, Indonesia, with a weak explosive type of eruption compared to other active volcanoes. Designing the magma chamber model may help reveal the characteristics of Slamet Volcano. The modelling uses the gravimetric satellite data from GGMplus, which is best in spatial resolution compared to other satellite data, i.e. 220 m. Data processing begins with Bouguer correction and terrain correction and has resulted in complete Bouguer anomalies data, with values ranging from 11.068 – 117.451 mGal. Further, residual Bouguer anomalies data were obtained after data reduction to the horizontal surface and removal of regional anomalies data, to obtain values ranging from -67.569 – 38.808 mGal. The residual anomaly contour map shows the lowest anomalous value is under the volcanic cone at positions of 109.21967° E and 7.24281° S which is estimated to be the location of the magma chamber of Slamet Volcano. However, the inversion modeling resulting from the residual Bouguer anomalies data shows that the magma chamber of Slamet Volcano can be observed clearly at positions of 109.22053° E and 7.24719° S. The location of the magma chamber is not perfectly vertical under the volcanic cone but has a slight slope. The obtained model of the magma chamber has a relatively small volume and shallow depth, i.e. about 1 – 4 km. The obtained physical parameters of the magma chamber impact the characteristics of the eruption of Slamet Volcano which tend to be weak explosive.

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Section: Results Of Processing Datamentioning

confidence: 99%

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Sehah

Prabowo

Raharjo

et al. 2022

CST

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“…This central part of the profiles is respective to geological structure composed of light-grey limestones (Wetterstein limestones) with a lot of karst phenomena. Based on the difference between the surface gravity and that at vertically projected points inside the railway tunnel we are able to estimate the mean density of the rock massif inbetween the tunnel level and the surface, upon applying respective corrections to the measured gravity due to the gravitational effects of topography, to the tunnel tube void, as well as to the effect of the normal gradient of gravity (Zahorec and Papčo, 2018). As a result we obtained the value of 2.66 g/cm 3 .…”

Section: Underground Gravity Data Analysismentioning

confidence: 99%

“…Hammer, 1950). To precise the estimate of the mean density of rocks of the given region we performed a detailed density analysis based on the approach of Mikuška et al (2017), as well as we also performed methodological measurements of gravity acceleration in the existing nearby parallel railway tunnel (at the depth of about 200 m below the surface), at spots where the surface gravimetric profiles cross the railway tunnel (Zahorec and Papčo, 2018).…”

Section: Introductionmentioning

confidence: 99%

High-precision local gravity survey along planned motorway tunnel in the Slovak Karst

Zahorec

Papčo

Vajda

et al. 2019

Contributions to Geophysics and Geodesy

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Results from a detailed gravity survey realized along the planned highway tunnel in the karstic area of Slovak Karst in the eastern Slovakia are presented. Detailed gravity profiles crossed an area of rugged topography, therefore the terrain corrections played a crucial role in the gravity data processing. The airborne laser scanning technique (LiDAR) was used in order to compile a high-resolution digital terrain model (DTM) of the surrounding area and to calculate terrain corrections properly. The difference between the Bouguer anomalies calculated with an available nationwide DTM and those with new LiDAR-based model can be significant in some places as it is presented in the paper. A new method for Bouguer correction density analysis based on surface data is presented. Special underground gravity measurements in the existing nearby railway tunnel were also conducted in order to determine the mean density of the topographic rocks. The Bouguer anomalies were used to interpret lithological contacts and tectonic/karstic discontinuities.

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“…The unpublished report of Hayford, which is at the moment inaccessible to us, was dated 1904. Since then, a lot of measurements of this type have been carried out and reported about, including the one of Hammer (1950) which we just mentioned, and, later on, e.g., Pick and Pícha (1971), Madej (2017), and finally Zahorec and Papčo (2018) to which we refer to here.…”

Section: Introductionmentioning

confidence: 99%

The comparison of different methods of determining the rock density from gravity data

ZAHOREC,

MIKUŠKA,

PAPČO

et al. 2023

Contrib. Geophys. Geod.

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We focus on two methods of determining the density of the rock environment based on gravimetric measurements. The first method, a combined underground-surface approach, relies on recent measurements made at pairs of points along the vertical. One point is located in accessible underground spaces, like tunnels, mine workings, or caves, while the other is on the Earth's surface. The second, surface method, is solely based on the analysis of the Gravimetric Database of the Slovak Republic. Both methods are based on the proportionality between free-air anomalies and the gravitational effect of topographic masses, calculated for unit density. We compare the respective outputs of both methods and attempt to understand the existing differences between them. We also confront the density estimates in question with one of the two existing density maps of Slovakia compiled from density measurements on rock samples. Across a total of 14 measured locations, we observe a relatively wide spectrum of values on the agreement-disagreement scale, ranging from close similarity to relatively significant differences.

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Estimation of Bouguer correction density based on underground and surface gravity measurements and precise modelling of topographic effects – two case studies from Slovakia

Cited by 5 publications

References 10 publications

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data

High-precision local gravity survey along planned motorway tunnel in the Slovak Karst

The comparison of different methods of determining the rock density from gravity data

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